Practice question

What is the operational standard for configuring marine 12V DC battery banks on a coastal sports vessel equipped with a '1 - 2 - BOTH - OFF' master selector switch?

  1. Isolate Bank 1 (Engine Starting) from Bank 2 (House/Domestic service); use Bank 1 for starting the engine and switch to Bank 2 or dedicated automatic charging relay at anchor to avoid draining the starting battery
  2. Always leave the switch on 'OFF' while navigating at sea
  3. Keep the switch permanently on 'BOTH' while at anchor with the engine stopped
  4. Connect the starting battery directly to the anchor chain to act as an electric winch

Answer: A — Isolate Bank 1 (Engine Starting) from Bank 2 (House/Domestic service); use Bank 1 for starting the engine and switch to Bank 2 or dedicated automatic charging relay at anchor to avoid draining the starting battery

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